Blinking every 20 minutes and then looking at a point 20 feet away for 20 seconds can protect your eyes during long periods of screen time.
Why it matters: Data suggests we're spending more than 18 years of our adult lives online — and that's not great news for our eyeballs.
How it works: When we stare at a screen, we forget to blink and our eyes dry out. The 20-20-20 rule relaxes eye muscles and encourages hydrating blinks.
"It affects us every decade of our life that we age more because the amount of tears we produce decreases," says Raj Maturi, spokesperson for the American Academy of Ophthalmology and ophthalmologist at Midwest Eye Institute in Indianapolis.
Caveat: There isn't extensive data to back up its benefits, but doctors endorse it as a good rule of thumb.
Blue light-blocking glasses, while popular, don't help with dry eyes, and doctors aren't impressed with them.
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